I got a network adapter issue...?

I have a network adapter built into my motherboard (obviously) in my Dell computer. The network adapter is made by the company Bel. In the device manager, under "Other Devices", it says that there is a problem with the Ethernet Controller (it's not installed). I had to format my computer in order to be able to log onto it because of a virus. I went to the Dell website and found a network adapter installation file which I downloaded and put on my other computer but it didn't work. I had also had a problem with the sound adapter, but I did the same for it and it worked for that. Do I have to get a network card? I don't want a network card... And I don't have money to take it in.